[EN] METHODS FOR PREPARING FLUOROALKYL ARYLSULFINYL COMPOUNDS AND FLUORINATED COMPOUNDS THERETO<br/>[FR] PROCÉDÉS DE PRÉPARATION DE COMPOSÉS FLUOROALKYLE ARYLSULFINYLÉS ET COMPOSÉS FLUORÉS APPARENTÉS
申请人:IM & T RES INC
公开号:WO2010022001A1
公开(公告)日:2010-02-25
Novel preparative methods for fluoroalkyl arylsulfinyl compounds are disclosed. Fluorinated compounds as useful fluorinated compounds, intermediates, or builing blocks are disclosed. Useful applications of the fluoroalkyl arylsulfinyl compounds are shown.
Efficient Osmium/Rhenium-Catalyzed Dihydroxylation of Olefins with Hydrogen Peroxide under Acidic Conditions
作者:Alida H. Éll、Adam Closson、Hans Adolfsson、Jan-E. Bäckvall
DOI:10.1002/adsc.200303043
日期:2003.8
Simple addition of citric acid confers great stability to the catalytically active osmium and rhenium species involved in a triple catalytic system utilizing aqueous hydrogenperoxide as the terminal oxidant. The resulting system is capable of dihydroxylating traditionally resistant olefins in high yields.
osmium-catalyzed dihydroxylation has uncovered that electron-deficient olefins are converted into the corresponding diols much more efficiently when the pH of the reaction medium is maintained on the acidic side. Further studies have identified citric acid as the additive of choice, for it allows preparation of very pure diols in yields generally exceeding 90%. As described here, a much wider range of olefin classes
Dihydroxylation and oxidative cleavage of olefins in the presence of sulfur
作者:Tarek Sammakia、T.Brian Hurley、Douglas M. Sammond、Randall S. Smith、Susan B. Sobolov、Thomas R. Oeschger
DOI:10.1016/0040-4039(96)00879-9
日期:1996.6
The dihydroxylation of olefins using AD-mix or in the presence of sulfides has been examined as has the rate of oxidation of various classes of sulfides. The selectivity of olefinoxidation in preference to sulfur oxidation depends on the nature of the sulfur moiety, and can be problematic for certain classes of substrates.
Chiral non-racemic dihydroxysulfones via hydrolytic kinetic resolutions—synthesis of oxacyclic ring systems using intramolecular acylation strategies
作者:Chunyang Jin、Raina D. Ramirez、Aravamudan S. Gopalan
DOI:10.1016/s0040-4039(01)00856-5
日期:2001.7
have been prepared in good yields and high enantiomeric excesses by hydrolytic kinetic resolution of the corresponding epoxysulfones with Jacobsen's (S,S)-salen(Co)III(OAc) catalyst. The intramolecular cyclization reactions of the acyl and ethoxycarbonyl derivatives of these dihydroxysulfones have been exploited to access a variety of functionalized chiral non-racemic cyclic ethers and lactones in good